The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
error
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java.lang.RuntimeException: Forged Alliance Crashed with exit code 1. See C:\ProgramData\FAForever\logs\game_15549760.log for more information
at com.faforever.client.game.GameService.lambda$spawnTerminationListener$43(GameService.java:676)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.j
ava:630)
at java.base/java.lang.Thread.run(Thread.java:832)